Re: Behavior of the -H RTS option, possible doc/impl mismatch

Hi Simon, Thank you for explanation. I think I now understand why -H behaves that way. 2011/2/17 Simon Marlow :

Anyway, with -N2 and above I don't recommend using -H, generally I've found it results in lower performance.  -A1m might be good if your CPUs have larger L2 caches.  I have some local patches that implement an option like -H but which applies to the old generation sizing rather than the nursery, which tends to work better with -N2 and above.

An experiment shows my program benefits from larger -H value, at least with a fixed -A. Also -A256M is much better than -A1M in my case, perhaps because decreasing the number of minor GCs is very important to the performance. -- Takano Akio

Cheers,        Simon